Pretty weird... No one has signaled me such bug... :/
Are you sure that you have done a correct archetype?
Create it under the HugeSpider instead of the spiders, and change change the model to test it.
The model should not be a problem normaly if the bin and the cal files are correctly put in mesh folder with it texture in txt16
Perhaps you got a problem while downloading the file that have corrupted it? Such thing happens sometimes!